The SUSTAIN Sport Heated Scarf utilizes patented heating technology to provide portable warmth while you are on the move. The embedded magnets allow you to put the scarf on and take it off in seconds, providing comfortable, constant warmth to your neck whenever you need it. It's rechargeable with any regular power bank, while a full charge will last longer than 3.5 hours, more than enough to keep you warm while you commune. Warm up from a simple click!